Borrowings and Credit Arrangements - Interest Expense under Convertible Notes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011
Debt Conversion [Line Items]
Non-cash interest expense	$ 81,177	$ 74,974	$ 76,814
Convertible Notes Payable [Member]
Debt Conversion [Line Items]
Amortization of debt discount	52,732	68,532	72,908
Amortization of deferred financing costs	3,048	3,828	3,906
Principal accretion	9,225
Non-cash interest expense	65,005	72,360	76,814
2.00% accrued interest	34,376	34,898	34,427
Interest expense, net	$ 99,381	$ 107,258	$ 111,241